HP DeskJet 840C (C6414A)
MFG Part Number: C6414A
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AC Adapter parts for C6414A HP DeskJet 840C Printer
C6414A-AC_Adapter
AC Adapter - Power supply module or adapter - one end for connecting to the printer and other end to the power cord, or your ac adapter may have the pwr cord attached.
DeskJet 840C Printer parts list